在spring應用中註冊interceptor思路

基本接口：WebMvcConfigurer或者WebMvcConfigurerAdapter；

函數：addInterceptors(InterceptorRegistry registry);

參數類型說明：InterceptorRegistry類只包含List<InterceptorRegistration>列表一個成員字段；InterceptorRegistration類封裝了

Interceptor對象、includeUrl和excludeUrls；

（1）向系統註冊一個攔截器

@Configuration
public class WebMvcConfig implements WebMvcConfigurer {

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new MyCustomInterceptor());
    }
}

（2）實現一個攔截器，攔截器實現HandlerInterceptor接口

public class MyCustomInterceptor implements HandlerInterceptor{

    @Override
    public boolean preHandle(HttpServletRequest request,HttpServletResponse  response){
    //your custom logic here.
        return true;
    }
}

（3）針對某些url進行攔截

 InterceptorRegistration.addPathPatterns()和InterceptorRegistration.excludePathPatterns()函數實現